Peat
Peat is an organo-mineral mass containing more than 60% (by weight) plant remains and characterized by high compressibility, low specific (from 1.3 to 1.6 g/cm³) and bulk density
Source: "SNiP 449-72. Construction Norms. Guidelines for the Design of Earthworks for Railways and Roadways"
(approved by the State Construction Committee of the USSR on 29.12.1972)
Peat: a geological formation consisting of plant remains altered during the process of bog-type soil formation
Source: "ORGANIC FERTILIZERS. TERMS AND DEFINITIONS. GOST R 53042-2008"
(approved by the Order of Rosstandart dated 15.12.2008 No Article 403